.gutter {
position: relative;
height: 16px;
width: 190px;
margin:0px auto;
padding:0px;
margin-top: 10px;
background: url(../images/bg_dott.png) repeat-x;
}
.knob {
position: absolute;
height: 16px;
width: 16px;
background: url(../images/arrow2.png) no-repeat;
cursor: pointer;
}